Banerjee Progna, Prakapenka Vitali B, Chariton Stella, Shevchenko Elena V
Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States.
Center for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, United States.
Nano Lett. 2024 Jun 12;24(23):6981-6989. doi: 10.1021/acs.nanolett.4c01285. Epub 2024 May 30.
In this study, we conducted a high-pressure investigation of CuSe nanostructures with pyramid- and plate-like morphologies, created through cation exchange from zinc-blende CdSe nanocrystals and wurtzite CdSe nanoplatelets respectively. Using a diamond anvil cell setup at the APS synchrotron, we observed the phase transitions in the CuSe nanostructures up to 40 GPa, identifying a novel CsCl-type lattice with 3̅ symmetry above 4 GPa. This CsCl-type structure, previously unreported in copper selenides, was partially retained after decompression. Our results indicate that the initial crystalline structure of CdSe does not affect the stability of CuSe nanostructures formed via cation exchange. Both morphologies of CuSe sintered under compression, potentially contributing to the stabilization of the high-pressure phase through interfacial defects. These findings are significant for discovering new phases with potential applications in future technologies.
在本研究中，我们对分别通过闪锌矿型CdSe纳米晶体和纤锌矿型CdSe纳米片进行阳离子交换制备的具有金字塔状和板状形态的CuSe纳米结构进行了高压研究。使用美国阿贡国家实验室同步加速器的金刚石对顶砧装置，我们观察到CuSe纳米结构在高达40 GPa的压力下的相变，确定了在4 GPa以上具有3̅对称性的新型CsCl型晶格。这种先前在硒化铜中未报道的CsCl型结构在减压后部分保留。我们的结果表明，CdSe的初始晶体结构不影响通过阳离子交换形成的CuSe纳米结构的稳定性。两种形态的CuSe在压缩下烧结，可能通过界面缺陷有助于高压相的稳定。这些发现对于发现具有未来技术潜在应用的新相具有重要意义。
